Can boesemani rainbowfish live with rosy barbs?

Verdict
Yes

Yes. Boesemani rainbowfish and rosy barbs make a good pair. Both are fine at 75–77°F. Plan on at least 30 gal.

Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8 Rosy barbRosy barb64–77°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–77°Boesemani rainbowfish 75–82°Rosy barb 64–77°
The green band is the temperature range both can live in.
456789Both: 7–7.5Boesemani rainbowfish 7–8Rosy barb 6–7.5
The green band is the pH both tolerate.

Size to scale

Boesemani rainbowfish · 4 inRosy barb · 4 in0"1"2"3"4"5"6"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

Boesemani rainbowfishRosy barb
Temperature75–82 °F64–77 °F
pH7–86–7.5
Adult size4.0 in4.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Better tank mates for rosy barbs

All rosy barb tank mates

Questions

Can boesemani rainbowfish live with rosy barbs?

Yes. Boesemani rainbowfish and rosy barbs make a good pair. Both are fine at 75–77°F. Plan on at least 30 gal.

What temperature suits both boesemani rainbowfish and rosy barbs?

75–77 °F. Boesemani rainbowfish need 75–82 °F, rosy barbs need 64–77 °F.

What size tank do boesemani rainbowfish and rosy barbs need together?

At least 30 gal, set by the boesemani rainbowfish. Add space for each extra fish.